For the purposes of 2257, it appears that they exempted "E".
As for thumbtgps, remember that a thumbnail is made from an original work. You must maintain on file for 2257 purposes a copy of the original image if it is sexually explicit. Therefore, you must be 100% certain that the original image is NOT sexual before you can use the thumb.
Good luck with it. I think the text link route will be what really covers everyone's ass.
Alex
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